vc打开关闭串口程序

UINT  CSeries::ReadProc(LPVOID lpParam);

BOOL CSeries::Init(int port,
              DWORD BaudRate,    //波特率  
              BYTE StopBits,        //停止位
              BYTE Parity,          //奇偶校验位
              BYTE ByteSize,         //数据位
              int BuffCount)
{
    if(bInit)
    {
        strErrorMsg="串口已经被你打开！";
        return FALSE;
    }

    portID=port;

    char szPort[32];
    wsprintf( szPort, "COM%d", portID);
    m_hComm = CreateFile( szPort,
                    GENERIC_READ | GENERIC_WRITE,                      //读写模式
                    0,                                                 //不共享
                    NULL,                                              //默认安全模式
                    OPEN_EXISTING,                                     //打开方式：打开已经存在的端口
                    NULL,
                    NULL);

    if( m_hComm == INVALID_HANDLE_VALUE )
    {
        strErrorMsg.Format("串口%d打开失败!",portID);
        return FALSE;
    }

    DCB  dcb;
    if (GetCommState(m_hComm,&dcb) == FALSE)
    {
        strErrorMsg="获取串口配置失败！";
        return FALSE;
    }
    
    dcb.BaudRate=BaudRate;
    dcb.StopBits=StopBits;
    dcb.Parity=Parity;
    dcb.ByteSize=ByteSize;

    if (SetCommState(m_hComm,&dcb) == 0)
    {
        strErrorMsg="设置串口配置失败！";
        return FALSE;
    }

    if(BuffCount > 0)
    {
        SetupComm(m_hComm, BuffCount , BuffCount);
    }


    COMMTIMEOUTS comTimeOut;                    // COMMTIMEOUTS对象

    comTimeOut.ReadIntervalTimeout = 3;         // 接收时，两字符间最大的时延
    comTimeOut.ReadTotalTimeoutMultiplier = 3;  // 读取每字节的超时
    comTimeOut.ReadTotalTimeoutConstant = 2;    // 读串口数据的固定超时
                                                  // 总超时 = ReadTotalTimeoutMultiplier * 字节数 + ReadTotalTimeoutConstant
    comTimeOut.WriteTotalTimeoutMultiplier = 3; // 写每字节的超时
    comTimeOut.WriteTotalTimeoutConstant = 2;   // 写串口数据的固定超时
    SetCommTimeouts(m_hComm,&comTimeOut);    // 将超时参数写入设备控制
    

    m_hEndThreadEvent =::CreateEvent(NULL,TRUE,FALSE,NULL);
    m_pThreadRead = ::AfxBeginThread(ReadProc,this);

    if(!m_pThreadRead)
    {
        strErrorMsg="创建读串口线程失败！";
        return FALSE;
    }
    
    bInit=TRUE;

    return TRUE;
}

BOOL CSeries::Close()
{
    if(bInit==FALSE)
    {
        strErrorMsg="串口已经关闭！";
        return FALSE;
    }

    SetEvent(m_hEndThreadEvent);

    if(CloseHandle(m_hComm) == 0)    // 调用该函数关闭串口
    {
        CString strTemp;
        strErrorMsg.Format("串口%d关闭失败!",portID);

        return FALSE;
    }

    bInit=FALSE;
    return TRUE;
}